1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
4 */
5
6 #ifndef _ASM_RISCV_FIXMAP_H
7 #define _ASM_RISCV_FIXMAP_H
8
9 #include <linux/kernel.h>
10 #include <linux/sizes.h>
11 #include <linux/pgtable.h>
12 #include <asm/page.h>
13
14 #ifdef CONFIG_MMU
15 /*
16 * Here we define all the compile-time 'special' virtual addresses.
17 * The point is to have a constant address at compile time, but to
18 * set the physical address only in the boot process.
19 *
20 * These 'compile-time allocated' memory buffers are page-sized. Use
21 * set_fixmap(idx,phys) to associate physical memory with fixmap indices.
22 */
23 enum fixed_addresses {
24 FIX_HOLE,
25 /*
26 * The fdt fixmap mapping must be PMD aligned and will be mapped
27 * using PMD entries in fixmap_pmd in 64-bit and a PGD entry in 32-bit.
28 */
29 FIX_FDT_END,
30 FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1,
31
32 /* Below fixmaps will be mapped using fixmap_pte */
33 FIX_PTE,
34 FIX_PMD,
35 FIX_PUD,
36 FIX_P4D,
37 FIX_TEXT_POKE1,
38 FIX_TEXT_POKE0,
39 FIX_EARLYCON_MEM_BASE,
40
41 __end_of_permanent_fixed_addresses,
42 /*
43 * Temporary boot-time mappings, used by early_ioremap(),
44 * before ioremap() is functional.
45 */
46 #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE)
47 #define FIX_BTMAPS_SLOTS 7
48 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS)
49
50 FIX_BTMAP_END = __end_of_permanent_fixed_addresses,
51 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1,
52
53 __end_of_fixed_addresses
54 };
55
56 #define __early_set_fixmap __set_fixmap
57
58 #define __late_set_fixmap __set_fixmap
59 #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
60
61 extern void __set_fixmap(enum fixed_addresses idx,
62 phys_addr_t phys, pgprot_t prot);
63
64 #include <asm-generic/fixmap.h>
65
66 #endif /* CONFIG_MMU */
67 #endif /* _ASM_RISCV_FIXMAP_H */
68
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